Hook



FIG. 1 is a perspective view showing the new design of a hook;

FIG. 2 is a right side view thereof, the left side view being a mirror image thereof;

FIG. 3 is a front view thereof;

FIG. 4 is a rear view thereof;

FIG. 5 is a bottom view thereof; and,

FIG. 6 is a top view thereof.

The surface shading and broken lines in the drawings are shown for illustrative purposes only and form no part of the claimed design. 

The ornamental design for a hook, as shown and described. 